{"id":"CVE-2026-43253","summary":"iommu/amd: move wait_on_sem() out of spinlock","details":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: move wait_on_sem() out of spinlock\n\nWith iommu.strict=1, the existing completion wait path can cause soft\nlockups under stressed environment, as wait_on_sem() busy-waits under the\nspinlock with interrupts disabled.\n\nMove the completion wait in iommu_completion_wait() out of the spinlock.\nwait_on_sem() only polls the hardware-updated cmd_sem and does not require\niommu-\u003elock, so holding the lock during the busy wait unnecessarily\nincreases contention and extends the time with interrupts disabled.","modified":"2026-05-28T03:54:13.123406086Z","published":"2026-05-06T11:28:43.160Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43253.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/715c263119fd1b918a9fcbd8a36ea5b604a46324"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d2a0cac10597068567d336e85fa3cbdbe8ca62bf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e15768e68820142077bbca402d8e902f64ade1b0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f2f65b28d802a667119147444ec2ae33eebf9a58"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43253.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43253"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4bf5beef578e46393f11eb69dda7d17a065e05ff"},{"fixed":"f2f65b28d802a667119147444ec2ae33eebf9a58"},{"fixed":"715c263119fd1b918a9fcbd8a36ea5b604a46324"},{"fixed":"e15768e68820142077bbca402d8e902f64ade1b0"},{"fixed":"496269d12072ecb219826485bdbec70c92a8eef5"},{"fixed":"d2a0cac10597068567d336e85fa3cbdbe8ca62bf"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43253.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.9.0"},{"fixed":"6.6.128"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.75"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43253.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}